1 /* crypto/pem/pem_seal.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh (at) cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay (at) cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59 #include <openssl/opensslconf.h> /* for OPENSSL_NO_RSA */ 60 #ifndef OPENSSL_NO_RSA 61 #include <stdio.h> 62 #include "cryptlib.h" 63 #include <openssl/evp.h> 64 #include <openssl/rand.h> 65 #include <openssl/objects.h> 66 #include <openssl/x509.h> 67 #include <openssl/pem.h> 68 #include <openssl/rsa.h> 69 70 int PEM_SealInit(PEM_ENCODE_SEAL_CTX *ctx, EVP_CIPHER *type, EVP_MD *md_type, 71 unsigned char **ek, int *ekl, unsigned char *iv, EVP_PKEY **pubk, 72 int npubk) 73 { 74 unsigned char key[EVP_MAX_KEY_LENGTH]; 75 int ret= -1; 76 int i,j,max=0; 77 char *s=NULL; 78 79 for (i=0; i<npubk; i++) 80 { 81 if (pubk[i]->type != EVP_PKEY_RSA) 82 { 83 PEMerr(PEM_F_PEM_SEALINIT,PEM_R_PUBLIC_KEY_NO_RSA); 84 goto err; 85 } 86 j=RSA_size(pubk[i]->pkey.rsa); 87 if (j > max) max=j; 88 } 89 s=(char *)OPENSSL_malloc(max*2); 90 if (s == NULL) 91 { 92 PEMerr(PEM_F_PEM_SEALINIT,ERR_R_MALLOC_FAILURE); 93 goto err; 94 } 95 96 EVP_EncodeInit(&ctx->encode); 97 98 EVP_MD_CTX_init(&ctx->md); 99 EVP_SignInit(&ctx->md,md_type); 100 101 EVP_CIPHER_CTX_init(&ctx->cipher); 102 ret=EVP_SealInit(&ctx->cipher,type,ek,ekl,iv,pubk,npubk); 103 if (ret <= 0) goto err; 104 105 /* base64 encode the keys */ 106 for (i=0; i<npubk; i++) 107 { 108 j=EVP_EncodeBlock((unsigned char *)s,ek[i], 109 RSA_size(pubk[i]->pkey.rsa)); 110 ekl[i]=j; 111 memcpy(ek[i],s,j+1); 112 } 113 114 ret=npubk; 115 err: 116 if (s != NULL) OPENSSL_free(s); 117 OPENSSL_cleanse(key,EVP_MAX_KEY_LENGTH); 118 return(ret); 119 } 120 121 void PEM_SealUpdate(PEM_ENCODE_SEAL_CTX *ctx, unsigned char *out, int *outl, 122 unsigned char *in, int inl) 123 { 124 unsigned char buffer[1600]; 125 int i,j; 126 127 *outl=0; 128 EVP_SignUpdate(&ctx->md,in,inl); 129 for (;;) 130 { 131 if (inl <= 0) break; 132 if (inl > 1200) 133 i=1200; 134 else 135 i=inl; 136 EVP_EncryptUpdate(&ctx->cipher,buffer,&j,in,i); 137 EVP_EncodeUpdate(&ctx->encode,out,&j,buffer,j); 138 *outl+=j; 139 out+=j; 140 in+=i; 141 inl-=i; 142 } 143 } 144 145 int PEM_SealFinal(PEM_ENCODE_SEAL_CTX *ctx, unsigned char *sig, int *sigl, 146 unsigned char *out, int *outl, EVP_PKEY *priv) 147 { 148 unsigned char *s=NULL; 149 int ret=0,j; 150 unsigned int i; 151 152 if (priv->type != EVP_PKEY_RSA) 153 { 154 PEMerr(PEM_F_PEM_SEALFINAL,PEM_R_PUBLIC_KEY_NO_RSA); 155 goto err; 156 } 157 i=RSA_size(priv->pkey.rsa); 158 if (i < 100) i=100; 159 s=(unsigned char *)OPENSSL_malloc(i*2); 160 if (s == NULL) 161 { 162 PEMerr(PEM_F_PEM_SEALFINAL,ERR_R_MALLOC_FAILURE); 163 goto err; 164 } 165 166 EVP_EncryptFinal_ex(&ctx->cipher,s,(int *)&i); 167 EVP_EncodeUpdate(&ctx->encode,out,&j,s,i); 168 *outl=j; 169 out+=j; 170 EVP_EncodeFinal(&ctx->encode,out,&j); 171 *outl+=j; 172 173 if (!EVP_SignFinal(&ctx->md,s,&i,priv)) goto err; 174 *sigl=EVP_EncodeBlock(sig,s,i); 175 176 ret=1; 177 err: 178 EVP_MD_CTX_cleanup(&ctx->md); 179 EVP_CIPHER_CTX_cleanup(&ctx->cipher); 180 if (s != NULL) OPENSSL_free(s); 181 return(ret); 182 } 183 #else /* !OPENSSL_NO_RSA */ 184 185 # if PEDANTIC 186 static void *dummy=&dummy; 187 # endif 188 189 #endif 190
